Reducing Sights Using Pub 249, ContinuedOPNAV 3130/32ACTIONCompleted StripH.O.249 Air AlmFormGHA(h)Enter the GHA hour value of Aries from282° 35.1'the Air Almanac to the nearest 10 minutes.(See fig. 9-18).Increment (m/s)Enter the minutes and seconds value from1° 35.5'the interpolation tables of the Air Almanac.Total GHAAdd GHA(h) and Increments (m/s).284° 10.6'+ - 360 (if needed)a Long (+E, -W)Enter the assumed DR longitude to arrive at17° 10.6'Wan even degree of LHA, add east andsubtract west.LHAa LATHcHoaLHA= Total GHA + (v/v or SHA for starsand planets) +E or -W DR Long.Enter the assumed latitude.Enter Pub 249 volume I, with the wholedegree of LHA for REGULUS, record Hcand Zn (last block). (See fig. 9-19.)Drop down Ho from above.Find the difference between Hc and Ho(remember to use Ho MO To). In thisexample, Ho is more than Hc, so itsnamed T for towards.267° 00.0'37°N40° 23.0'40° 26.4'T 3.4'ZnEnter the Zn (true bearing).264°As you can see, using Pub 249 to determine a celestial LOP is a quickprocess compared to using Pub 229. Keep in mind that some amount ofaccuracy is lost.9-35